Research On Occurrence And Prevention Of Tobacco Root Knot Nematode Disease In Gengma County

In2009, tobacco root knot nematode disease incidence was analyzed and recorded though monitoring the growth and decline trends of the second instar larvae in the soil of the21points on tobacco-growing areas from Mengsa town Gengma county of Yunnan Province, In2009～2010, the field trials were conducted to study the control effect of biological source preparation, as the "Hongtuyun" organic fertilizer,11kinds of chemicals and biological organic fertilizer strain as3%Furadan, and RW4biological chemical, which against tobacco root knot nematode. The results show that:1) There was a certain regularity that tobacco root-knot nematodes showed in the soil, generally showed several peaks.30days after transplanting,2nd instar larvae increase in a large number to a peak. About40-60days after transplanting was the Second peak that the initial infection of the root-knot nematode mature breeding first generation of the peak, the population density of surge2) KRK26’s resistance on the root-knot nematode was significantly different on K326, the cultivation of resistant varieties was the feasible method to resist knot nematode disease3) The number of primary infection on tobacco root-knot nematode will have a significant impact on development of breeding trends, especially in K326,which is susceptible cultivar. There is a clear correlation on the extent of root-knot nematode disease occurrence.4) Soil type, the predecessor of the ebb have significant influence on the root-knot nematode larvae, dynamically rotation can reduce the number of root-knot nematode, mitigate its damage.5)The organic fertilizer "Hongtuyun"in comparison with other tested Bio-medicaments for preventing effect is slightly better, but with the other tested agents,which had no significant difference;6)3%Furadan,5%o"Kenbanglinexianzun",2%"Xianyashuangwei","Xiandi"powder and water, etg, which for testing chemicals against root knot nematodes have certain inhibition;7)The effect of RW biological organic fertilizer and "Miaogenjian " biological agents to control tobacco root knot nematode disease performed better.